英语语法分析

Tough sheaths push through the earth and do the backwork needed for the emergence.

坚韧的叶鞘拱出了土壤，需要对突出体作辅助工作。

This is largely composed of the fatty myelin sheaths around neurons and so reveals the brain's connections.

白质主要由神经元周围的脂肪髓鞘组成，揭示了大脑的连接。

When I looked down my shoes were his two terribly dirty scuffed sheaths of cheap disintegrating leather.

我低头一看，发现两人的鞋穿错了，脏得不行，廉价的分叉的羽毛都磨得差不多了。